The True Heiress is the Reserved Fiancé's Exclusive Memory - Chapter 637 - 653

The story begins with the last day of Yggdrasil, a popular online game which is being quietly shut down. Our protagonist Momonga decides to stay in his beloved game until the last moment, so waits for the forced logout. Unexpectedly, the server does not shut down and Momonga is stuck in a skeleton avatar in another world. “The powerful Overlord” needs now to discover the new world and face the continuous challenges that arise.

On the first day of their divorce, he said, “She'll be back before midnight.”The second day, “She'll be back in three days. It's just one of her stunt to make me mad”.The third day, “She cannot do without me so she'll be back in seven days.”On the seventh day, “She'll definitely come back within two weeks.”After a whole month... “Boss she's really doing it, she's kissed a stranger at the gala.”“Catch her and bring her home.”In her past life she was the good and enduring wife, in this life she became his little devious sin. A pain in the ass and his little ass kicker.“No one dared treat Mr Hamilton the way she did, do you think he would forgive her?”Harlow Blackwood was accused and wrongfully killed in her past life by her family and husbands family. But fate had other plans for her.When she returned, Harlow swore to take revenge on the people who killed her children and ended her life. But there was something else in this life. The husband who joined her enemies to attack her in her previous life turned out to dot on her more than ever before.In her past life Harlow was a mighty cook and would prepare food for the entire family, she turned into their slave to please them, yet no one liked her.But in this life...“I am useless hubby, I can't cook, clean, have kids or take care of you...Her hubby smiled. “None of those matters. I can cook, clean, take good care of you, and most importantly, give you children. How many are you willing to have?”In her current life, her husband has a huge secret too, what could that be?

A little ruffian who fought recklessly without any morals and bottomline accidentally time-traveled to parallel space and became a Key Case Investigation Team agent. The huge change in identity had him creating chaos in the police station. However, a strange miracle system helped him repeatedly solve mysterious cases, turning him into an impudent ruffian detective!

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.